in Delphi DB ::
When creating database applications in Win32 Delphi you might find the multicast idea useful - to have more than one procedure execute when the OnAfterScroll event fires for the TDataset descendant, for example. The "TMultiDsEvent" class enables you to add multicast event handlers feature TDataSet and TField descendants.

Read the full article to learn how to Implement MultiCast Events for Win32 Delphi's TDataset and TField descendants.

Related:

• Simulating multicast events in Win32 Delphi
• Simulating class properties in Win32 Delphi
• Delphi for .NET

in Delphi TIPS :: Delphi does not provide any "ready made" RTL function to test if a given directory (folder) is empty, i.e. contains no files or sub-folders. The IsDirectoryEmpty function provides the answer.

Read the full article to learn how to check if a directory is empty

Related:

• How to Search for Files and Folders (matching a mask)
• DirectoryExists RTL function
• Directory Helper Routines

in TXmlDocument :: When using the TXMLDocument to create XML documents you might receive a nasty EOleException: This operation can not be performed with a Node of type PCDATA.

If you want the resulting XML to look "pretty" - so that each element node appears on its own line, indented appropriately to reflect its nesting in the node hierarchy, you might be adding the doNodeAutoIndent flag in the Options property of the TXMLDocument instance.

Read the full article to learn how to Fix the "This operation can not be performed with a Node of type PCDATA" when using doNodeAutoIndent

Related:

• How to Create the !DocType and ?XML Elements using TXmlDocument Delphi component
• Delphi Does XML: Creating, Parsing and Manipulating XML Documents with Delphi
• Validate an XML Against a DTD Using TXMLDocument and Delphi

in Delphi TIPS :: The WM_SYSCOMAND can be used to trap the restore window operation. When the form is maximized the "Maximize" button changes its look and operation. Clicking the restore button restores the window to its previous (normal, before it was maximized) position and size. By overriding (changing) the default "restore" action, you can for example, create a Delphi form that can be only mimimized or maximized.

Read the full article to learn How to Override Delphi Form's Restore Operation?

Related:

• Handling Windows Messages
• Capture Maximize/Minimize Menu button click
• Display a Password Dialog when Restoring a Delphi Application from the TaskBar